Adjustable multiple-cutter boring-bar



(No Model.) 3 Sheets-Sheet 1. J. STONE. Y I ADJUSTABLE MULTIPLE CUTTERBORING BAR.

' No. 408.154. Patented May 14, 1889.

w'ntnessasz I (No Model.) 3 SheetsSheet 2. J. STONE. ADJUSTABLE MULTIPLEGUTTER BORING BAR.

Patented May 14, 1889.

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J. STONE. ADJUSTABLE MULTIPLE CUTTER BORING BAR. N0. 403,154. PatentedMay 14, 1889.

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JMMT 3M 7 V UNITED STATES PATENT OFFICE.

JABEZ STONE, OF WVATERFORD, NElV YORK.

ADJUSTABLE MULTIPLE-CUTTER BORING-BAR.

SPECIFICATION forming part of Letters Patent No. 403,l54, clated May 14,1889.

Serial No. 281,924. (No model.)

To all whom it may concern:

Be it known that I, JABEZ STONE, a resident of Waterford, in the countyof Saratoga and State of New York, have invented certain new and usefulImprovements in Adj ustable Multiple-Cutter Boring-Bars; and I do herebydeclare that the following is a full, clear, and exact description ofthe invention, that will enable others skilled in the art to which itappertains to make and use the same, reference being had to theaccompanying drawings, and to the letters of reference marked thereon,which form a part of this specification.

Similar letters refer to similar parts in the several figures therein.

My invention relates to improvements in adjustable multiple-cutterboring-bars; and it consists of the novel construction and combinationof parts hereinafter described, and pointed out in the claims.

Figure 1 of the drawings is a side elevation of my improved bar and asection of a valvecase, the bar being shown in position forsimultaneously working in opposite directions upon two faces of thecase. Fig. 2 is a plan view of the boring-bar detached when viewed fromthe bottom, as shown in Fig. 1. Fig. 8 is a vertical cross-section ofthe parts shown in Fig. 2, taken centrally of the bindingscrew 0, andupon a considerably enlarged scale. Fig. 4 is a similar section taken onthe broken line y y in Fig. 2. Fig. 5 is a similar section taken on thebroken line a a in Fig. 2. Fig. 6 is a front elevation-of one of thevalve-faces shown in Fig. 1, with the other portions of the valve-casebroken away. Fig. 7 is a central longitudinal section of the boring-bar,taken on the broken line a a, Fig.

2. Figs. 1 and 6 are drawn upon the same scale, and all the remainingfigures upon an enlarged and uniform scale.

My improved boring-bar is adapted for use in a lathe or uprightboring-mill or other similar machine. It is preferably made with asquare or rectangular shank, A, provided with a circular head, A. Therectangular shank is adapted to fit and be fixed in the tool-post of alathe, mill, or other machine, or in a special block or saddle, Aattached to the carriage of the machine. The circular head is providedwith a central longitudinal bore, A adapted to receive a travelingtoolcarriage, B. The circular head is also provided with the radialslots A and A extending from said central bore outward, adapted toreceive and form a slideway for radial lugs projecting from thetraveling tool-carriage, the lug A, adapted to slide in the slot A, being provided with the tool-socket AT, adapted to receive the tool 0, andthe lug A being provided with a threaded aperture intersect ing thetool-socket, adapted to receive the tool-binding screw 0, which screwserves to hold the tool in place in its socket. The rectangular shank Ais also provided with a central longitudinal bore, A", extending fromthe bore in the circular head through the opposite end of the shank.

The traveling tool-carriage l) is provided with a threaded centralaperture adapted to receive a similar threaded stem, D, when inserted inthe longitudinal bore A". The stem is of sufficient length to engage atits threaded end with the carriage, While the other end of the stemprojects from the other end of the threaded and adapted to receive acorrespondingly and eXteriorly threaded nut, F.

The nut is centrally perforated to receive the end of the stem, and isalso provided with flange F adapted to engage with the end of the shankA, and so arranged that when the nut is screwed into the end of theshank until the flange F engages therewith the inner end of the nut willjust come in contact with the collar D on one side without bindingtightly thereon when the other side of the collar is in engagement withthe shoulder A as shown in Fig. 7. The threaded bindingscrew G, providedwith an operating-handle, G, is made to fit a correspondingly-threadedradial aperture 111 the shank at a point opposite the collar, wherebythe stem and the collar may be prevented from rotating when the screw Gis turned to bind thereon. The circular head may also be provided withany desired number of tool-sockets. I have shown two sockets, H and TI,adapted to receive the tools If and II, which tools are secured in theirrespective sockets by the bindingscrews H.

The object of the invention is, in facing, chasing, or performing othersimilar work upon metals, to work two or more cuttingtools mounted upona common boring-bar in opposite directions upon different parallelfacesas, for example, tools C and II upon the two opposite and parallelfaces JJ in the interior of the valve-case shown in section in Fig. 1,being shown located to cut on the dotted line in Fig. (l.

The operation of the device is as follows: The bar is first adjusted inthe saddle A in the usual manner, so that the tool. II will work againstthe face J. The tool 0, secured in the traveling carriage B, is thenadjusted to work against the opposite and parallel face .l by means ofthe wrench l)", the latter bein released by unscrewin the hinding-screwG. By turning the stem 1) to the right the carriage is drawn toward thecollar D the latter bearing upon the shoulder A and by turning the stemto the left the carriage is forced to travel from the collar, the latterbcarin upon the inner end of nut I as before expained. It will thus beseen that the cutter is adjustable longitudinally of the bar andindependently of the adjustment of the latter or of the cuttersstationary thereon. The cutter O is securely locked in its adjustedposition by means of the hinding-screw G, operated to bear againstcollar D as before explained.

Different sizes ol the boringha r may be employed, and the distanceapart of the sla tionary tool-slots maybe so proportitmed to the travelof the carriage as to afford any required spacing of the tools-forexample, when working upon the faces J J it is evident the tooll'l,could be removed as superfluous, and if the faces were so near togetherthat the tool 11 and the tool 0 could not be inserted between them byreason of the limited travel of the toolcarriage, then the tool ll.could be removed from the socket ll and inserted in the socket ll.(Shown in Fig. 1 as occupied by tool I1 I am thus able to double thecapacity of the boring-bar in performing the kinds of work describedwithout materially adding to the expense of operating it.

Vhat I claim as new, and desire to secure by Letters Patent, is-

1. In a multiple-cutter boring-bar, a stationary fixed bar provided witha tool-socket, in combination with a tool-carriage for carrying aseparate tool, n'iovably supported by such fixed bar and adjustablelongitudinally thereon, for the purpose of simultaneously cutting twointerior faces, substantially as described.

2. The combination, in a multiple-eutter boring-bar, of a shank, A, headA, provided with tool-sockets ll, tool-carriage ,1novably mounted uponthe head, carriage-adjusting stem 1 and means for locking the adjustingstem, as binding-screw G, substantially as described, and forthe purposeof simultaneously working two cutting-tools upon the opposite faces of astraight-way valve.

In testimony whereol'I have hereunto set my hand this 1st day of August,1838.

JABEZ C'lONlC.

W itn esscs:

(Elmo. A. lllOSI-IER, W. ll. ll(')LLISl"lGR, Jr.

